55 lines
1.0 KiB
C
55 lines
1.0 KiB
C
#include "string.h"
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void memcpy(void*dst, const void *src, size_t size) {
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for (size_t i = 0; i < size; i++) {
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((char*)dst)[i] = ((const char*)src)[i];
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}
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}
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void kmemmove(char* dst, char* src, size_t size) {
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if (dst == src) return;
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if (dst > src && dst < src + size) { // s d
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// copy right-to-left
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for (; size != 0; size--) {
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dst[size - 1] = src[size - 1];
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}
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} else {
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// copy left-to-right
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for (size_t i = 0; i < size; ++i) {
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dst[i] = src[i];
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}
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}
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}
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int strncmp(const char* s1, const char* s2, size_t size) {
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while (size && *s1 && *s2 && *s1 == *s2) {
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size--;
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s1++;
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s2++;
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}
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if (!size) {
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return 0;
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}
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return (unsigned char)(*s1) - (unsigned char)(*s2);
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}
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bool cstr_equal(const char* s1, const char* s2) {
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while (*s1 && *s2 && *s1 == *s2) {
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s1++;
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s2++;
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}
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return *s1 == 0 && *s2 == 0;
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}
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bool cstr_starts_with(const char *A, const char *B) {
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while (*A && *B) {
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if (*A != *B)
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return false;
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A++;
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B++;
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}
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return *B == 0;
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}
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